Reid Hoffman can rest easy tonight. As the founder of the first U.S.-based social network to go public, he’s just become an overnight gazillionaire. Or billionaire, at least. His 19 percent stake in the company was worth $1.5 billion when shares were trading at $81; now they’re hovering around $107.

LinkedIn shares jumped more than 140 percent in its first day of trading, peaking at $122 and valuing the company at $10 billion. For reference, that’s more than 521 times the eight-year-old company’s 2010 profits. There’s something to be said for being first to market.

LinkedIn’s underwriters managed to underestimate demand that much, even after last-minute increases of the company’s price from $10, to $42, to $45. LinkedIn could have raised double that, despite the fact that prior to its public debut, the company was only valued at $2.5 billion on private secondaries exchange SharesPost. The lesson here? Get ready for Facebook's IPO. At a secondary market valuation of $70 billion, its public market debut is likely to be huge.

Reid Hoffman can rest easy tonight. As the founder of the first U.S.-based social network to go public, he’s just become an overnight gazillionaire. Or billionaire, at least. His 19 percent stake in the company was worth $1.5 billion when shares were trading at $81; now they’re hovering around $107.

LinkedIn shares jumped more than 140 percent in its first day of trading, peaking at $122 and valuing the company at $10 billion. For reference, that’s more than 521 times the eight-year-old company’s 2010 profits. There’s something to be said for being first to market.

LinkedIn’s underwriters managed to underestimate demand that much, even after last-minute increases of the company’s price from $10, to $42, to $45. LinkedIn could have raised double that, despite the fact that prior to its public debut, the company was only valued at $2.5 billion on private secondaries exchange SharesPost. The lesson here? Get ready for Facebook's IPO. At a secondary market valuation of $70 billion, its public market debut is likely to be huge.